The following is sample Java program to get the list of indices in an Elasticsearch instance.

Sample Program:

package com.report.test;

import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;

public class SampleProgram{
     public static void main(String[] args) {
          String hostname = "localhost";
          String clusterName = "elasticsearch";

          Settings settings = ImmutableSettings.settingsBuilder().put("client.transport.sniff", true).put("cluster.name", clusterName).build();
          Client esclient = new TransportClient(settings).addTransportAddress(new InetSocketTransportAddress(hostname, 9300));

          String[] indexList = esclient.admin().cluster().prepareState().execute().actionGet().getState().getMetaData().concreteAllIndices();

	  System.out.println("Index List:");
	  for (String index : indexList) {
	       System.out.println(index);
          }
     }
}

Sample Output:

Index List:
student
employee

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